US Patent No. 9,310,443

VOLTAGE DETECTION APPARATUS AND METHOD OF REDUCING DISPERSION OF DARK CURRENTS


Patent No. 9,310,443
Issue Date April 12, 2016
Title Voltage Detection Apparatus And Method Of Reducing Dispersion Of Dark Currents
Inventorship Hidehiko Shimizu, Shizuoka (JP)
Kimihiro Matsuura, Shizuoka (JP)
Yusuke Tatara, Saitama (JP)
Shintaro Uchida, Saitama (JP)
Takayuki Yamamoto, Saitama (JP)
Assignee YAZAKI CORPORATION, Tokyo (JP) HONDA MOTOR CO., LTD., Tokyo (JP)

Claim of US Patent No. 9,310,443

1. A voltage detection apparatus, comprising:
a plurality of voltage detection units, each of which detects cell voltages of plural cells in each of blocks in a battery
module, the each of blocks including the plural cells connected in series;

a plurality of power supply circuits, to which power is supplied via power supply lines connected to the blocks respectively;
a dark current adjustment unit that adjusts dark currents respectively flowing through the plurality of power supply lines;
a plurality of current increase units that increases the dark currents so that the dark currents respectively flowing through
the power supply lines from the blocks when the voltage detection apparatus is in a sleep state become a same target value;
and

a plurality of current detection units which respectively detect the dark currents flowing through the plurality of power
supply lines,

wherein the plurality of voltage detection units are respectively supplied with the power from the plurality of power supply
circuit via the power supply lines; and

wherein the dark current adjustment unit includes:
a target value setting unit which sets the target value based on the dark currents detected by the plurality of current detection
units; and

a current control unit which changes resistance values of the plurality of current increase units so that each of the dark
currents flowing through the plurality of power supply lines becomes the target value.